[GreenKeys] Unknown military converter identification help.

[WA5CAB at cs.com]

Ken,

As Tom just said, it is most likely a CV-57/URR IF input type tuning 395-470 
KC.  The hinged cover in the center of the panel has been removed from yours.  
It had the nameplate on it.  However, although they are quite rare compared 
to the CV-57, it could also be a CV-71/URR which tunes 50 KC IF input.  They 
are physically identical to the point where the top view photo in the NAVSHIPS 
says it shows either one.  

CV-57/URR was used standalone or two of them with Comparator CM-14/URR 
comprise Converter-Comparator Group AN/URA-6.  Two each CV-71 plus one CM-14 make 
AN/URA-7.  There is a third (audio input) converter, CV-60/URR.  Two of them 
plus one CM-14 make up AN/URA-8 (not to be confused with the completely different 
AN/URA-8A or 8B that used CV-89(*)/URA-8 plus CM-22).

One tip before you apply AC power to smoke test it.  Find the blower, lube 
the bronze bearings with light oil (you can start with WD-40 until the fan will 
spin, then something like 10W).  If, as received, the blower isn't stuck I 
will be quite surprised.

In a message dated 11/23/2007 10:45:08 AM Central Standard Time, 
ksweek at mindspring.com writes: 
> I am trying to identify this converter as ID plates were missing. It 
> seems to be a Navy IF type converter. I have the outer case it but 
> doesn't help in identification either. When I find out what it is 
> then I will then be looking for a copy of the manual. Any help would 
> be appreciated.
> 
> Thanks,
> Ken S

Robert Downs - Houston
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